Caleb Carr (born August 2, 1955) is an American novelist and military historian. He was born in New York City, achieved a degree in history, and is the author of The Devil Soldier, The Alienist, The Angel of Darkness, Casing the Promised Land, Killing Time, The Italian Secretary, and The Lessons of Terror, among others.

He currently resides in upstate New York on a farm estate called "Misery Mountain" in the town of Berlin in Rensselaer County. He teaches military history at Bard College. He was a close friend and confidant of historian James Chace.

He was one of the contributing screenwriters for the film prequel to The Exorcist, released as Dominion: Prequel to the Exorcist, for which he received a shared story credit. He also received a shared screenplay credit on Exorcist: The Beginning.

Carr ran as an independent for the Rensselaer County Legislature in 2005 but was narrowly defeated.

His father is Lucien Carr, a former UPI editor and a key Beat generation figure.